Even though he was reincarnated in another world with expanding dreams and hopes, he didn’t have the cheats and harem he expected. In his growing anxiety, hearing the name of his newborn sister reminds him. “wait, huh? I’m pretty sure this name is the villain chara that appeared in the game…” The world he was reincarnated in was very similar to the game world he was playing just before he died. If the content of the game is correct, then Erina, the younger sister, is the villain who bullies the main character, and if the story progresses smoothly, destruction awaits in the end. “I have to raise her! I have to raise Erina into a fine lady!!” This is a (maybe magnificent) story of a boy who loves his sister.